Electrical apparatus



D.- M. BERGES ELECTRICAL APPARATUS 7 Nov. 26, 1940.

Filed Aug. .2, 1959 INVENTOR 4 Do/m/d MBe/yes Patented Nov. 26, 1940PATENT OFFICE ELECTRICAL APPARATUS Donald M. Berges, Alpine, N. Jassignor to Bendix Aviation Corporation, South Bend, 11111., a

corporation of Delaware Application August 2, 1939, Serial No. 288,053

10'Glaims. (Cl. 123-479) This invention relates to electrical apparatus,and particularly to the control of current flow and electro-magneticaction.

An object is to provide unitary means for producing both electrical andmechanical energy fiowas, for example, the closing of an electriccircuit and the coupling of mechanically rotatable members such as anengine crank-shaft and an engine-engaging gear or clutch for impartingin itial rotary movement to such crank-shaft."

It has heretofore been proposed to incorporate circuit controlling meanswith engine-engaging mechanical linkage, as a means of insuring flow ofcurrent to an ignition facilitating agency--- such as the induction coil92, of Allen Patent No. 2,141,33lin synchronism with the movement of theengine-engaging member (of an engine starter) to engine-engagingposition. When there is employed an ignition facilitating agency as suchas that shown at 92 in the Allen patent above identified (and also shownin the accompanying drawing at 19) it is customary to provide a specialterminal on the conventional high tension magneto-such as the terminalindicated 26 at H in the drawings of Hicks Patent No. 1,862,116 grantedJune 7, 'l932which terminal (as pointed out in the Hicks patentspecificavice is employed in aircraft, the operation of the (,0 currentcontrolling parts of the device is a cause 'of possible interferencewith the reception and transmission of radio signals; and an object ofthe present invention is to provide unitary circuit operating and workperforming linkage in- 45 volving such construction andinter-relationship of parts as to assure perfect shielding of theauxiliary ignition circuit against radio interference.

Another object is to provide for electro-mag- 50 netic operation of aunitary circuit operating and work performing linkage of the characterindicated. In this connection a feature ofv the invention is the ,use ofa. single set of terminals for dual duty: first, for securing the endsof the magnet winding, and secondly, for anchorage of thecontact fingersconstituting the normally separated elements of the switch controllingthe flow of current to the ignition facilitating agency or otherelectrical unit to beenergized'concurrently with operation of themechanical linkage above 5 referred to.

These and other objects of the invention will become apparent frominspection of the following specification when read with reference tothe accompanying drawing wherein is illustrated the 10 preferredembodiment of the invention. It is to be expressly understood, however,that the drawing is for the purpose of illustration only, and is notdesigned asa definition of the limits of the invention, reference beinghad to the al pended claims forthis purpose.

In the drawing- Fig. 1 is a central sectional view of a device embodyingthe invention;

Fig. 2 is a sectional view of a portion of the as sembly of Fig. 1,showing the relationship of parts In the several views the referencenumeral Ill engine engaging clutch element shiftable in one direction inresponse to energization of the winding M of the solenoid assemblycontained within the shell [0; a clutch element of this character beingindicated diagrammatically at IS in Fig. 3. 40

The plate H is provided with a central opening, and a guide member 25 ismounted with its outer end suitably fixed in said opening as'by means ofthe upset flange or lip indicated at 26.

The member 25 extends inwardly from the plate II and constitutes a fixedmagnetic pole piece centrally located within the solenoid. A connectingmember in the form of a rod 21 of nonmagnetic material is mounted toslide freely within pole piece .25, and is provided at one end with amovable core or plunger 30 of magnetic material and of slightly smallerdiameter than the outside diameter of the fixed pole piece 25. The

. plunger is suitably secured to the connecting rod 21 as by means of apin-48, and at its opposite '55 end is centrally bored and threaded toreceive a screw 33 having a head 34 adapted to receive pivotally one endof a lever or bellcrank 35 having connection at its opposite end 36 withthe device to be actuated such as, for example, the clutch shiftingmechanism of the above identified Allen patent. Also as in said Allenpatent a suitable spring or equivalent means (not shown) may be providedto maintain the plunger rod 21 in the position indicated in Fig. 1 untilsuch time as I ceives the solenoid winding I4 as well as the terminalposts 38 and 46 which, as shown, are a molded in the head portion 31 ofthe spool 38. At its outer end the terminal post 39 receives a contactfinger 6| whose curved end 62 is adapted to rest upon the cylindricalsurface of a switch element 63 mounted upon and movable with the plungerrod 21 upon which it is adjustably secured by suitable means such as thesplit rings 65 and 66; and'a similar contact finger 61 is mounted on theterminal post 40 and is also adapted to rest upon the switch element 63but at a point thereon which lies in a plane that is axially spaced fromthe plane of contact of the finger 6|, so that in the normal position ofthe parts as shown in Fig. 1 the finger 6| rests upon the non-conductingportion 1| of the switch element 63 while finger 61 restsupon'themetallic and hence current conducting portion 12. When, however,the plunger rod 21 is shifted to its opposite extreme position as by thepassage of current through the Winding I3 and the resulting closure ofthe air 'gap between the fixed and movable pole pieces 25 and 36,respectively, the switch element 63 rides along between the fingers 6|and 61 until both said fingers make contact with axially separated butelectrically united portions of the metallic sleeve 11 of the switchassembly (as shown in Fig.'2),,thereby completing a circuit from thesource 18 (Fig. 3) to the ignition facilitating agency 19 by way of theswitch contacts 80 (said switch having first been closed to energizewinding l4), conductor 8|, the finger 6|, the sleeve 11, and the fin'ger61.

To employ motor M (Fig. 3) as the accelerating means for flywheel F ofthe engine starter, the operator may utilize the same source of currentas for the energization of solenoid winding l4, and the motor controlswitch contacts 86 'may be bridged by remotely disposed control, toper-I mit use of a short heavy cable from source 18' to said switchcontacts 86, and the installation of said switch in proximity to themotor housing.. To this end there is provided a second solenoid 82energizable to close switch 86, the flow of current to said solenoidbeing by way of normally open contacts 83, in shunt with contacts 86,and bridgeable by the same manually operable contact maker 84 as are thesaid contacts 66, although the said contact maker is normally disposedin an intermediate position 01 nonengagement' with either set 80 or theset 63.

Due to the above described connection to the magneto-distributor, thewire leading'from the auxiliary agency," necessarily enters the housingof the main magneto, and in consequence thereof it is a potential sourceof interference with the reception and transmission of radio signals bymeans of radio equipment in adjacent locations. As a means of minimizingsuch interference I provide features of the switch structure which inand of themselves constitute a practically perfect barrier to radiofrequency oscillations, since the exposed conducting portion 12 of theswitch element 63 is in contact with finger 61 and therefore serves toground the induction,

coil side of the switch (by way of rod 21 and housing l3) during theentire period in which the switch remains in open circuit position. Thusthe element 63 tends to eliminate any positive capacitance value acrossthe said fingers 6| and 61, by providing a path to ground for any energyoscillations in the area intercepted thereby.

In Fig. 1 there is also shown a desirable form of readily detachableterminal connection for switch finger 61, involving a spring-pressedsnap rivet '68 registering with a slot in the lower end of finger 61,and removable with insulating bushing 69 whenever retaining nut 10 forcable 13 is unthreaded from its mounting boss on housing section l2.

What I claim is:

1. In a device of the character indicated, the combination of a set'oicurrent conducting switch elements, means including an insulatingelement normally preventing current flow from one of said switchelements to the other, current conducting means integrated with saidinsulating element and serving to intercept energy waves emanating fromsaid switch elements, and means for moving the intercepting means to aposition of current conducting relationship with respect to both saidswitch elements.

2. In a device of the character indicated, the combination of a set ofcurrent conducting switch elements, and meansincluding a third currentconducting member interposed between said switch elements and serving inone -position to facilitate current flow from one of said switchelements to the other, and in another position to intercept energy wavesemanating from saidtive capacitance valve acrossthe said fingers.

3. In a device of the character indicated, the combination of a solenoidwinding, a spool of insulating material to receive said winding, saidspool having a pair of metallic terminal posts embedded therein, acurrent conducting switch element mounted on each of said terminalposts, and means including a third current conducting member interposedbetween said switch elements and serving in one position to facilitatecurrent flow. from one of said switch elements to the other, and inanother position to intercept energy waves emanating from said switchelements, and thereby eliminate any positive capacitance value acrossthe said fingers.

4. In a device of the character indicated, the combination of a set 01'current conducting switch elements, means including a third currentconducting member interposed between said switch elementsand serving inone position to facilitate current flow from Tine of said switchelements to the other, and in another position to intercept energy wavesemanating from said switch elements, and thereby eliminate any positivecapacitance value across thesaid fingers, and electromagnetic means formoving said thirdcurrent member from one of said positions tocombination of .a solenoid winding, a spool of insulating material toreceive said winding, said spool having a pair of metallic terminalposts embedded therein, a current conducting switch element mounted oneach of said terminal posts, means including an insulating elementnormally preventing current flow from one of said switch elements to theother, and current conducting means integrated with said insulatingelement and serving to intercept energy waves emanating from said switchelements, thereby eliminating any positive capacitance value across saidswitch elements. a

6. In an electro-magnetic device for use with internal combustion enginestarting mechanism or the like, the combination of a set of ignitionfacilitatingswitch elements, means including an insulating elementnormally preventing current flow from one of said switch elements -tothe other, and common means including an electro magnet forsimultaneously connecting the engine starting mechanism yvith the engineand removing said insulating element from current flow preventingposition. I

7. In a device for use with internal combustion engine startingmechanism or the like, the com- 8. In a device for use with mechanicallyro- I tated torque transmitting mechanism or the like, the combinationof a set of current conducting switch elements, means including aninsulating element normally preventing current flow from one of saidswitch elements to the other, .current conducting means integrated withsaid insulating element and serving to intercept energy waves emanatingfrom said switch elements, and common means for simultaneously movingthe torque transmitting mechanism to torque transmitting position andthe intercepting means to a position of current conducting relationshipwith respect to'both said switch elements.

9. In a device of the character-indicated, the

combination of ,a solenoid winding, a spool of insulatingmaterial toreceive said winding, said spool having a pair of metallic terminalposts embedded therein, a current conducting switch element mounted oneach of said terminal posts, means including an insulating elementnormally preventing current now from one of said switch elements to theother, current conducting means 10. In a device of the characterindicated, the

combination of a solenoid winding, a spool of insulating material toreceive said winding said :spool having a pair of metallic terminalpostsembedded therein, a-current conducting switch element mounted on each ofsaid terminal posts,

means including a third current conducting .member interposed betweensaid switch elements and serving in one positionto facilitate currentflow from one of said switch elements to the other, and in anotherposition to intercept en'- ergy waves emanating from said switchelements,

and thereby eliminate anypositive capacitance value across the saidfingers,- and means including magnetic pole pieces operative upon thepas- ;sage of current through said solenoid winding to cause movement ofsaid third current con-.- ducting member to a position of currentconducting relationship with respect to both said switch elements.

DONALD M. BERGES.

